Divergent saw-tooth fastener



S. C. CARY.

DIVERGENT SAW TOOTH FASTEN'ER. APPLICATION FILED MAY 31. 1919.

1,328,911. Patented Jan 2 7, 1920.

' vergent Sa -Tooth"Fastener, of

SPENCER C. CARY, OF BROOKLYN, NEW YORK.

DETERGENT SAW-TOOTH FASTENER.

To all whom it may concern: I Y

Be it known that I, SPENCER C. CARY, .a citizen of the United States, residing at the city of New York, borough of Brooklyn. county of Kings, and State ofNew York, have invented a certain new and useful Di.-

which the following is a specification.

The invention is a divergent saw tooth fastener, the objects in view being to so improve the construction as to result in drawing together two pieces .of wood or other material into which the fastener is adapted to be driven, and to impart to the penetrating edge of the fastener such formation as will insure the easydriving of the fastener either with or across the grain of the wood and with practically no tendency to deflection from a straight line in the driving operation.

The salient feature of my new fastener is the provision of a straight cutting edge intermediate the saw tooth edges on' certain corrugations which are in divergent relation to a central plane member of the fastener,'said straight cutting edge bein in the medial plane of the fastener and in t e same P1311116 as the edges or points on the saw teet fastener of my invention comprises a single as to produce a planeweb which are in diart a flat wedge web being proedge, and .corrugations unitary with sai web and parallel to the divergent side edges thereof, said, corrugations being provided ,with saw teeth the edges of which are in alinement with the stra ght cutting edge of the wedge shaped web, the edges of the saw teeth and the cutting ed e of the web-lying in the medial plane of the fastener.

The new fastener piece so formed the opposite side edges of vergent relation so as to im appearance thereto, the sai Figure l is a side elevation, on an em larged scale, of the divergent fastener.

Fig. 2 is a view looking at the penetratingredge of the fastener.

ig. 3 is a view partly in elevation and partly in section illustrating the fastener driven into the wood or other material.

The fastener embodies a central fiat web Specification of Letters Patent. Application filed my 31,

More specifically stated, the divergent is illustrated in the. accompanying drawing, wherein- Patented Jan. 27, 1 920. 1919. swarm. 300,795.

A and corrugations B C, said web being intermediate the corrugations. The edges of the web at the sides thereof are inclined at a b, so that the web is narrower at the driving edge than it is at the penetrating edge, the web having a wedge shaped appearance. The edge at the wide end of the web is beveled on the opposite faces'of said web, pro- .ducing a cutting edge 0, the same being a straight edge of appreciable length.

The corrugations B C are made with the J web in one piece ofimetal, the latter being bent and rebentto produce one, two or more corrugations at each side of the fiatweb. The corrugations B are parallelto theinclined edge a of the web, whereas corrugations C are parallel to the inclined edge 6, and thus the. corrugations 5B O occupy a divergent relation to each other.

It is essential that the corrugations BIC be provided withsaw teeth,.D, the points 0! of which are in the plane of themedial line of the fastener. I

The saw tooth formation is produced upon the corrugations in accordance with certain swaging, notching or cutting out, and tooth alinlng processes disclosed in certainprior patents 'and applications for, patents to which I am a party; but it may be stated,

briefly, that such teethare formedbyfirst the latter per orming the additional func-" tion of alining said points in the plane of the medial line of the fastener. It may be added that prior to the first swaging operation the flat metal stock is or may be ground on the penetrating edge for the purpose of preliminarily removing some of the metal, thus reducing the quantity of the metal required to be removed by the sw aging and cutting dies in the notching or cutting operation.

My fastener is characterized by the use of a straight cutting edge between a plurality of saw teeth on the penetrating edge the points of-the saw teeth bein alined and.

lying in the-medial plane of t e -corruga-" tlons and the flat web, the medial line of the fastener, i. e. that line midway between the crests of the corru ations being indicated by the dotted line X of Fig.2.

A further structural feature is a flat web intermediate adjacent corrugations, the side I edges of the web being divergent and the the we oppositely located corrugations being paralle res ectively, to: said. divergent edges of b; said web being provided with a straight cutting edge positioned between and in 'allnement with the points of saw teeth .which are provided on'the corrugations at the enetrating edge of-the fastener.

T e saw teeth and the c utting edge enable the fastener to penetrate the material and they cut through thezsame, so that the fastener drives easily and cuts its way cleanly through the wood, either w ith or across the gram. The saw tooth formation acts with. a draw shear 'cut on the wood and the divergent relation of the corrugations imparts to the {fastener a characteristic action in drawing together two pieces of wood, or

other material, so'that the pieces are drawn into forcible contact by the act of driving the fastener, as shown in Fig. 3. It will be noted that the fiat wedge shaped Web is in termediate the divergent corrugations, and.

in the. operation of drivin the fastener the straight cuttin'gedge of t is flat web penetrates, the material easily and cleanly Withoutunn'ecessary. crowding of the fibers, the efi'ect of which is to give to the divergent corrugations a better opportunity of drawing to ether the separate pieces of material into w ich the fastener is driven.

Having thus fully described the invention,

points ofthe saw plane of the fastener.

bodying 1 what Iclaim as new, and desire to secure by Letters Patentis:

1. A divergent sawtooth fastener embodying a fiat web andecorr'ugations at the res'pective sidesolfhtlie' web and in divergent relation to each other, said corru tions being providedwifih saw teeth an said web having a straigt intermediate the saw teeth. and in alinement therewith, said straight cutting edge and the teeth lying in the medial 2. A divergent saw tooth fastener em a fiat web the side edges of which are inc ned, and corrugations parallel to the inclined edges at the respective sides of. the web and having a divergent relation to, each other, said corrugations being provided with sawjeethand saidwveb having-a straight cuttmg edge intermediate said saw teeth, the polnts of the saw teethand the cutting edge of the web being in alinement with each other'and lying in the medial plane of the fastener.

v3. divergent saw tooth fastener embodylnga flat web the side edges of which penetrating edge of are inclined and the which is beveled to produce a straight.cut-.

ting edge of appreciable length, and a p'lu-' rality of corrugatlons at the respective sides SPENCER cl CARE.

cutting edge positioned 

